General Information:
Chemical Formula:Ca2Sb+++++Mg4Fe+++Si4Be2O20
Composition:(Molecular Weight = 765.25 gm)Calcium 5.24 %
CaMagnesium 12.70 %
MgBeryllium 2.36 %
BeIron 7.30 %
FeSilicon 14.68 %
SiAntimony 15.91 %
SbOxygen 41.81 %
O Empirical Formula: CaSbMg4Fe3+Si4Be2O20
IMA Status:Approved IMA 1978
Physical Properties: Cleavage:None
Color:brown, reddish black, orange brown, or deep tan.
Density:3.77
Diaphaniety:Subtranslucent to Opaque
Hardness:6 - Orthoclase
Luster:Subadamantine
Streak:light brown
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